Investigation of an on-line pipe wall defect monitoring sensor

Issue title: Selected Papers from the 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), Part I

Article type: Research Article

Authors: Tagawa, Akihiro^{a; *} | Fujiki, Kazunari^a | Kojima, Fumio^b

Affiliations: [a] Japan Atomic Energy Agency, Shiraki, Tsuruga-shi, Fukui-ken, 919-1279, Japan | [b] KOBE university, 1-1, Rokkoudai-cho, Nada-ku, Kobe-shi, Hyougo-ken, 657-8501, Japan

Correspondence: [*] Corresponding author. Tel.: +81 770 39 1031; Fax: +81 770 39 9226, E-mail: [email protected]

Abstract: This paper presents development of a defect monitoring sensor using electromagnetic acoustic transducer (EMAT). The present study investigates the possibility of the defect monitoring using a new EMAT structure. The current EMAT was unsuitable for monitoring because of the large sensor area, and also it was necessary to have a mechanical scanning. Therefore, it was developed a new EMAT, smaller in size which does not need a mechanical scanning. The new EMAT was manufactured for a trial purpose. Based on the result of the performance test, it was found out that the new EMAT is able to monitor a defect and also to monitor both a thin and thick piping wall.

Keywords: Electromagnetic acoustic transducer (EMAT), halbach magnet structure, double coil

DOI: 10.3233/JAE-2010-1168

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 639-647, 2010